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Material Selection

 

The environment in which a seal will operate should be determined before selecting the sealing or lip material. It must consider the functions of the seal as follows:

COMPARISON TABLE
1 -Very good           2 -Good for  most*application 
3 -Fair, can be used if other materials available but otherwise not recommended
4. Not recommended
CODE NR SBR EPDM  CR NBR ACM (PA) SI FPM
Properties\ Compound Natural Rubber  Styrene Butadiene Copolymer Ethylene Propylene Rubber Poly-chloroprene  Nitrile Rubber Poly-acrylate Silicone Rubber Fluoro Rubber (Viton)
 Tensile 1 2 3 1 1 4 4 1
 Durometer 30-100 40-100 30-80 40-90 30-100 40-90 30-90 55-90
 Rebound 1 3 2 1 2 3 3 3
Abrasion Resistance  1 1 2 2 1 3 4 3
 Impact Strength  1 1 2 1 2 4 4 3
 Gas Impermeability  3 3 3 2 2 3 4 2
Oxygen Resistance  3 3 2 2 3 2 1 1
 Ozone Resistance  4 4 1 2 4 2 1 1
Weathering      Resistance  3 3 1 2 3 2 1 1
 Heat Resistance  4 3 1 2 3 2 1 1
 Low Temperature  2 3 2 3 3 4 1 2
 Water Resistance  1 2 1 2 2 4 2 2
Oil and Fuel     Resistance 4 4 4 2 1 1 3 1
Animal, Vegetable Oil 3 3 2 2 1 1 2 1
Alcohol Resistance  2 2 2 1 2 2 2 2
Alkaline Resistance  3 3 2 1 2 4 4 2
 Acid Resistance  2 2 1 1 1 3 3 1
 Aliphatic Solvent  4 4 4 2 1 1 4 1
 Aromatic Solvent  4 4 4 2 1 1 4 1
 Oxygenated  Solvent  2 2 1 4 4 4 3 4
CODE NR SBR EPDM CR NBR ACM (PA) SI FPM
* Other materials like: P.T.F.E , Butyl, Vamac, Felt, and Leather are also available for seals and other molded products  
* Please contact TCK for your specific applications and requirements
METAL CASE AND SPRING:
The other major components of an oil seal are metal case and garter spring
 
CASE  
SAE. NO AISI NO. APPLICATION COST  
1008~1010 1008~1010 GENERAL LOW  
SAE 30304  304 SPECIAL CORROSION RESISTANCE HIGH  
The metal case generally is produced from carbon steel for general applications in oil or grease. For special applications when sealing sea water for corrosive fluids for gases, stainless steel can be applied at an increase in price. Other metal cases such as Aluminum and Brass are available for your specific applications and requirements
 
SPRING  
SAE. NO AISI NO. APPLICATION COST  
1070~1080 1070~10880 GENERAL LOW  
30304 304 SPECIAL CORROSION RESISTANCE HIGH  
C5210R C5210 CORROSION & AGING RESISTANCE HIGHER  
For the garter spring, piano wire is used for general applications. Where corrosion resistance or extreme heat resistance is required, stainless steel is available.

 

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